But did you know that you can also switch an in-progress call between your iPhone and Apple Watch—and not just regular cellular phone calls, but FaceTime Audio ones, too?

Although watchOS has always supported handing off from Apple Watch to iPhone, Apple has made changes in watchOS 4.2 to support sending calls in the other direction, too.

Switching calls between iPhone & Apple Watch

This capability requires an iPhone, iPad or iPod touch with iOS 11.2 or later and any Apple Watch model with watchOS 4.2 or later. Your phone and watch must have both Bluetooth and Wi-Fi enabled and Handoff must be turned on for both devices: